[syzbot] [io-uring?] [mm?] general protection fault in lock_vma_under_rcu

[syzbot <syzbot+556fda2d78f9b0daa141@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    e5d3fd687aac Add linux-next specific files for 20250218
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1643b498580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4e945b2fe8e5992f
dashboard link: https://syzkaller.appspot.com/bug?extid=556fda2d78f9b0daa141
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=138207a4580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ef079ccd2725/disk-e5d3fd68.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/99f2123d6831/vmlinux-e5d3fd68.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eadfc9520358/bzImage-e5d3fd68.xz

The issue was bisected to:

commit 0670f2f4d6ff1cd6aa351389130ba7bbafb02320
Author: Suren Baghdasaryan <surenb@google.com>
Date:   Thu Feb 13 22:46:49 2025 +0000

    mm: replace vm_lock and detached flag with a reference count

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1355bfdf980000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10d5bfdf980000
console output: https://syzkaller.appspot.com/x/log.txt?x=1755bfdf980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+556fda2d78f9b0daa141@syzkaller.appspotmail.com
Fixes: 0670f2f4d6ff ("mm: replace vm_lock and detached flag with a reference count")

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 27018 Comm: syz.1.4414 Not tainted 6.14.0-rc3-next-20250218-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:vma_refcount_put include/linux/mm.h:712 [inline]
RIP: 0010:vma_end_read include/linux/mm.h:811 [inline]
RIP: 0010:lock_vma_under_rcu+0x578/0xac0 mm/memory.c:6454
Code: be 5d b1 ff 49 be 00 00 00 00 00 fc ff df 4d 85 ff 74 0d 49 81 ff 01 f0 ff ff 0f 82 a3 02 00 00 49 83 ff f5 0f 85 55 03 00 00 <41> 80 3e 00 74 0a bf 05 00 00 00 e8 28 df 18 00 4c 8b 34 25 05 00
RSP: 0000:ffffc9000b837d80 EFLAGS: 00010246
RAX: fffffffffffffff5 RBX: 0000000000000000 RCX: ffff888079eb8000
RDX: ffff888079eb8000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000b837ed8 R08: ffffffff8210a26a R09: 1ffff110068be328
R10: dffffc0000000000 R11: ffffed10068be329 R12: ffffc9000b837e10
R13: ffff88802890aa20 R14: dffffc0000000000 R15: fffffffffffffff5
FS:  00005555908b1500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000400000002fc0 CR3: 0000000011df6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_user_addr_fault arch/x86/mm/fault.c:1328 [inline]
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x17b/0x920 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f617a954ed8
Code: fc 89 37 c3 c5 fa 6f 06 c5 fa 6f 4c 16 f0 c5 fa 7f 07 c5 fa 7f 4c 17 f0 c3 66 0f 1f 84 00 00 00 00 00 48 8b 4c 16 f8 48 8b 36 <48> 89 37 48 89 4c 17 f8 c3 c5 fe 6f 54 16 e0 c5 fe 6f 5c 16 c0 c5
RSP: 002b:00007ffc20f24718 EFLAGS: 00010246
RAX: 0000400000002fc0 RBX: 0000000000000004 RCX: 0031313230386c6e
RDX: 0000000000000008 RSI: 0031313230386c6e RDI: 0000400000002fc0
RBP: 0000000000000000 R08: 00007f617a800000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000009 R12: 00007f617aba5fac
R13: 00007f617aba5fa0 R14: fffffffffffffffe R15: 0000000000000006
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:vma_refcount_put include/linux/mm.h:712 [inline]
RIP: 0010:vma_end_read include/linux/mm.h:811 [inline]
RIP: 0010:lock_vma_under_rcu+0x578/0xac0 mm/memory.c:6454
Code: be 5d b1 ff 49 be 00 00 00 00 00 fc ff df 4d 85 ff 74 0d 49 81 ff 01 f0 ff ff 0f 82 a3 02 00 00 49 83 ff f5 0f 85 55 03 00 00 <41> 80 3e 00 74 0a bf 05 00 00 00 e8 28 df 18 00 4c 8b 34 25 05 00
RSP: 0000:ffffc9000b837d80 EFLAGS: 00010246
RAX: fffffffffffffff5 RBX: 0000000000000000 RCX: ffff888079eb8000
RDX: ffff888079eb8000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000b837ed8 R08: ffffffff8210a26a R09: 1ffff110068be328
R10: dffffc0000000000 R11: ffffed10068be329 R12: ffffc9000b837e10
R13: ffff88802890aa20 R14: dffffc0000000000 R15: fffffffffffffff5
FS:  00005555908b1500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff182f3cf98 CR3: 0000000011df6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	5d                   	pop    %rbp
   1:	b1 ff                	mov    $0xff,%cl
   3:	49 be 00 00 00 00 00 	movabs $0xdffffc0000000000,%r14
   a:	fc ff df
   d:	4d 85 ff             	test   %r15,%r15
  10:	74 0d                	je     0x1f
  12:	49 81 ff 01 f0 ff ff 	cmp    $0xfffffffffffff001,%r15
  19:	0f 82 a3 02 00 00    	jb     0x2c2
  1f:	49 83 ff f5          	cmp    $0xfffffffffffffff5,%r15
  23:	0f 85 55 03 00 00    	jne    0x37e
* 29:	41 80 3e 00          	cmpb   $0x0,(%r14) <-- trapping instruction
  2d:	74 0a                	je     0x39
  2f:	bf 05 00 00 00       	mov    $0x5,%edi
  34:	e8 28 df 18 00       	call   0x18df61
  39:	4c                   	rex.WR
  3a:	8b                   	.byte 0x8b
  3b:	34 25                	xor    $0x25,%al
  3d:	05                   	.byte 0x5


---
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